Technics SEA 5 Brochure
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Page 1
SE-AS
Stereo DC Power Amplifier
New Class A with LFB
The SE ·AS power amplifier employs Technics
New Class A circuitry, a design which eliminates
the switching and crossover distortion assoclat·
ed with conventi onal class 8 amplifiers. New
Class A provides the low distortion of class A
amplifiers, yet maintains the power efficiency of
class 8 amplifiers. Although the New Class A
circuitry itself results in distortion figures as low
as the best amplifters in the audio industry.
Technics has gone another step beyond.
Class B amplifier 0\Jijl
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the amplifler chassis and rover can be made of m agnellc materials, so It can shield the amp from effe<:tS of both external electromagnetic fields and e4ectrostatlc charges; the amp may be placed side-by-side or stacked with any other audio components. Three-Dimensional Analysis (3D A) Reveals Outstanding Performance The SE-AS's superior performance becomes obvious when illustrated with the Technics 3DA graph (back page). This visual device was deve loped by Tec hnics for use with amplifiers, and shows distortion measurements on the order of parts per million (ppm). At Its rated output of 120 watts per channel, the THO of the SE·AS is a mere 0.002% (2(}-20,000 Hz, 8 ohms), and remains within 0.002% even with an output as low as 250 mW. The 3DA graph also shows ihe extremely wide power bandwidth. 5Hz to 100 kHz with less than 0.007% THO. Independent Left and Right Channel Power Supplies Obviously, rugged, heavy�u1y performance Is a must in power amps. The Impedance of speaker systems varies from 4 to 16 ohms. nominally. And even 8 ohm speakers connected in parallel (A+ B) will present a 4 oh m. so it is easy to see the importance of solid construction In power amps. To satisfy this variety of load require ments, the SE·AS is equipped with Independent power supplies for the left and right channels using four 10,000 11F high capacity electrolytic capacitors. The powerful power supply and large heat sinks are able to sustain 160 watts per channel, both channels driven Into 4 ohms from 20-20, 000 Hz, with no more than 0.003% THo-performance is always outstanding, regardless of the speaker configuration (within the specified 6mits of the amplifier's capability). Output Power Selector Switch One ol the special features of the SE ·AS Is the output power selector switch. In the FULL position, full rated output ol120 watts per channel may be obtained. In the LIMITED position, output power Is restricted to a more modest 30 watts per channe4, retaining all the benefits of high power reserve. yet providing the same ultra -low distor tion and excellent frequency response as in the full position. This feature allows the unit to be used at reduced power levels at night or whenever it is not possible or practical to use a full 120 watts of power (this can be a great money-saver for users who prefer to leave their amps running at all times-the idle current's pow8f' consumption Is a mere 33 watts). The LIMITED position also extinguishes the meter IDumlnatlon for additional power savings. Other Features -Fully electronic protection circuit protects the speaker systems and power amp In the unlikely event of DC potential appe aring at the speaker terminals. A re4ay acts to protect the amplifier from a short circuit across the speaker terminals or when an extremely low impedance load Is encountered. -Large power meters give direct readings from 0. 000 1 W to lull power. Meter response Is based on BTS specifications and meter indication closely matches the VU type. -Floating coil power transformer for low hum and low magnetic flux leakage. -SIN ratio of 123 dB with very low residual noise. -Current surge protection circuit. Peak current is not reached until a few seconds after power is turned on. -Easy-to-connect speaker terminals. -Distinctive heavy-duty die-cast panels. -Durable, gold-plated input terminals and connectors on acc essory cables. SU-A6 Stereo DC Control Amplifier Class A Circuitry Throughout ... Low Noise FET Differential Inputs Eliminate Capacitors The Tech nics SU-A6 Is a high perfor mance preamp which can be used with any high fidelity power amplifier. h employs class A circuitry from input to output, and FET differential inputs in all stages for complete input capacitor-less (ICL) circuitry. Basic circuitry consists of the high-gain ICL phono equalizer amp, ICL DC fiat amp, and DC output amp. Only one coupling capacitor is used (at the phono equalizer output), making this amp capable of straight DC amplification from high level inputs (tuner, aux. and tape) to output. Parallel Low Noise FET ICL Phono Equalizer Amp Technics SU-A6 consists of two ultra-low noise dual FET differential amps connected in parallel -these form the first stage of the phono equalizer. Thus, phono EO is input capacitor less for extremely low noise. The high-gain phono equalizer Is capable of direct MC cartridge connection and gain Is simply reduced for compatibility with MM cartridges. Phone SIN ratio is 79 dB for MM cartridges (IHF 78). and 76 dB lor MC cartridges (IHF "78)-these f�gures of fer outstanding performance for a preamp in t his price range. And with an AIAA deviation of :!:0.2 dB (20-20,000 Hz).it Is obvious that the SU-A6 has been designed to please the most discriminating listener. Plus, linear response Is maintained all the way up to 100 kHz (±0.5 dB). This high performance equalization means that even square wave inputs may be reproduced with a high degree of accuracy. Phono Equalizer Noise Spectrum High-Gain FET DC Aat Amp and Single End Push Pull {SEPP) Output Amp The flat amp and output amp are pure DC amps without a single capacitor in the signal path. When used with a DC power amplifier, the SU·A6 will al low DC amplifiCation which extends all the way to the speaker terminals. Utilizing an SEPP output amp reduces the output impedance to an extremely low 2 ohms. Thus, the length of the power amp connection cable does not affect system performance, allowing the power amp to be placed far from the preamp. And a rated output of 2 volts is sufficient to drive even the lowest sensitivity amplifiers with ease. The power supply consists of two sets of balanced outputs with stabilized current load, and Zener diodes with superior thermal characteristics limit DC drift to an absolute minimum. 4-Ganged Volume Control The volume control is2·gangedfor each channel (located on both sides of the flat amp) for a 4 -ganged master vOlume control. It prevents noise when the volume Is turned down and improves the overall SIN ratio. Top Performance with All Cartridges The SU·A6 1s equ ipped with two phone input terminals. Phono 1 has fou r positions and may be used for low output MC, high output MC. low output MM. or high output MM cartridges. With a single selector switch, compatibility with any cartridge is available, eliminating any chance of a mismatch between the cartridge output and preamp input sensitivity while also providing excellent SIN ratio. MM cartridge input i mp�ance Is 4 7 kilohms. and 100/220 ohms for MC cartridges depending on the MC input selection. Shelving Tone Controls To obtain outstanding low and high frequency response with today's audio systems and source material, you may need more equalization facili ties than are included on most conventional pre amps. Technics· unique type of shelving tone control satisfies this require (llent. It consists of steep slope Super-Bass and Super-Treble con trols, plus a regular gentle sjoping bass and treble configuration, rovering a wide range. These four controls can be used in combination to provide a wide range of equalization charac teristics. In recent years, people's taste has been leaning toward deep bass reproduction. With only a conventional bass control, many speakers have been over-<:ompensated in the mid bass range (which resuhs in boorn y, unrealistic sound), but still poorly compensated in the deep bass region. Boominess. even if caused by poor listening room acoustics or speaker position. can be effectively controlled by attenuating the gentle sloping bass. and turning up the Super Bass controls. Shelving Tone Control Characteristics